I have two computers, one with SP1 and the other SP2. I set up a network,
computer with SP1 sees itself in My Network Places and also gets response
when pinging its ip, but does not see the other computer and no response for
pinging the ip of the other computer. The computer with SP2 does not see
itself and the other computer and no response for pinging its ip or the ip
of other computer.

I checked everything, workgruop names etc and I turned off firewalls but the
result is the same. Do you have any idea?

I am planning to uninstall SP2